Safety device for elevators.



A. KAMPFE. SAFETY DEVICE FOR ELEVATORS. APPLICATION FILED DEC- 24 I914.

1 149,450. Patented Aug. 10, 1915.

W/T/VESSES: INVENTOR & 6 {W BY wm ATTORNEYS ivrrn as ATENT oFFio .AUGUSTKAMPFE, F CLEVELAND, Oll-IIO.

SAFETY DEVICE FOR ELEVATORS.

specificationjof Letters Patent. t te 1 5 Application filed December 24,1914. Serial No. 878,267.

for Elevators, of which the following is a specification.

This invention pertains to safety devices for elevators, and the objectof the invention is to provide three safety precautions which aremutually dependent and coiiperate to protect an elevator against 1possible accident To these ends, I provide means to automatically look:a door when the car is I 'ble of movement. when thecar is at the land-,

- away fromthe landing either direction and to automatically.unlock-thesame when at a landing; secondly, to automatically opened and toautomaticallyunlockor.re-' lease the car when the door is thirdly, togrip the operating cable when the door is opened and the car locked andto release the cable when the door is closed and the car unlocked tomove in either direction. In the two latter movements, the door is theinitial actuating medium While, in the first instance, the freedom ofthe door is dependent on the position of the car'in respect to thelanding.

In the accompanying drawings, Figure 1 is a'relatively'sectionalelevation of 'a car and a door at a landing with the parts in theposition seen in Figs. 2 and 3. Fig. 2 is a sectional elevation atright'angles'to Fig. 1. Fig. 3 is a horizontal View and Fig.

4 is an enlarged sectional elevation showing the door locking mechanismin locking position. the recess or pocket inset in the door in which thelatch engages. v

' As thus shown C represents the car, or

a part thereof, and D the door. L is the landing and 2 the pivoted latchor dog by which the door is locked. The said latch is supported on apost or standard 3 from the landing and has an arm 0. adapted to rotateinto and out of a specially provided pocket or ricess 4 in the door, asseen especially 'in Fig. 4:. The inner edge of said latch is circular orsegmental and has a series of teeth or serrations adapted to be engagedby the spring-pressed shoe 5 on the car and by which the said latch isrotated out of the recess in the door. when the car reaches the landing,thus releasing the door to be opened,

, lock; the car at the landing when the door is closed, and

' may Fig. 5 is a section ofthe latch and Fig.1. The said latch is shownas having two opposite springs 6 connected therewith in such relation asto close the latch the in- "stant'the car starts from the landing andthus lock the door, and the shoe '5 is under a measure of springpressure on its end sup ',-ing and is provided with initial means foractuating the said looks, so that in the opening of the door both locksare automatically" j-brought into engagement and when closed both locksare automatically disengaged. I Thus, the door has a rack or series ofteeth 8011 its bottom edge in engagement with a pinion 9 on the end of arotatable shaft 10 and'which terminates at thev landing. The said shafthas a worm or thread 11 of long pitch in actuating engagement with ayoke 12 mounted thereon and controlling a thrust bolt 13 at .each end.The said'bolts are supported in suitable keepers in the landing andengage extension rods 14 having heads engaged by said boltsand adaptedto be thrust endwise' bythe bolts in such measure as be needed to bringthe cable gripping or looking against the cable next beneath or at the Vshaped stud 16, or its equivalent, the object in any event being to holdthe cable temporarily against movement up or down by the operator 1n.the car or, for that matter,

' by any one else. Movement is conveyed from the said rods or, extensionbolts 14' to the said lock 15 through or by means of a cross-bar 1'?which has sleeve supports 18 on its ends in which the extension boltsjustment and. support, and a stem 20 centrally on said cross bar 17piivotally engages one end of a pivoted lever 21 while the other 22connecting it with A link 24 connects end thereof has a link a bellcrank lever 23. said lever with the lower ends of the pivoted lock. 15for the cable. Spring S serves to reverse or open all said parts whenthe thrust by primary bolts 13 is relieved and the door is closed.Spirally wound Springs 14 have a threaded ad member 15 into engagementon the bolts 1.4 bear against the heads of said bolts at one end andagainst the ends of the crossbar 17 at the other end in the said sleevesl8, and serve to communicate thrust from bolts 13 to said bar. henthrust withdrawn the springs 25 carry bolts ll back to startingposition. The lull reipiires only a slight play to perform its functionand this arrangement permits the bolts to move a greater distance thanthe bar.

Thus it follows that when a landing has been made the door isautomatically liberated to be opened and the'opening thereofautomatically locks the elevator car and the cable. Then in order tomove the car and to turn on the power the door must first be closed.This automatically releases both locks and the operation of the elevatorproceeds otherwise as if no special safety mechanism were present.

What claim is: 1. An elevator car, a landing door and an operatingcable, in combination of mechanism for locking the car at a landing andthe said cable simultaneously comprising a rack on the bottom of thesaid door, a worm screw in the landing and a yoke adapted to said meanscomprising a screw located in the door landing and a yoke adapted to runthereon and a set of bolts engaged with said yoke and adapted to bethrust into the car, in combination with gripping means for the cableconsisting of a fixed stud at the landing, a lever pivoted betweenitsends on the car and adapted to press the cable against said stud, apair of bolts in thrusting rela.

tions with said locking bolts, a cross-bar connecting the outer ends ofsaid pair of bolts and a retracting spring for the said bar, and leverand link connections with said bar adapted to operate said lockinglever.

An elevator having a car and an operating cable, in combination with asliding door and means operatively connected therewith and adapted tolock the car at a land ing and to grip the said cable simultaneously,said means comprising a pair of locking bolts supported in the landingand. adapted to engage the car, a worm screw in the landing and a pinionthereon, a rack on the bottom of the door engaging said pinion, a yokeon said screw and engaged at its ends with the heads of said bolts, apair of auxiliary spring-pressed bolts engaged by said locking bolts anda cross bar connecting the same, a locking lever for the cable andmea'ns to actuate the said lever having operating connection with saidcross bar, whereby both the car and the cable are simultaneously locked.

In testimony whereof I aflix my signature 1n presence of two wltnesses.

AUGUST KAMPFE.

Witnesses:

lR. B. Mosnli, M. SorIwAN.

